酸浸—萃取工艺从富钴结壳矿中提取钴、镍、铜、锰

RECOVERING Co,Ni,Cu AND Mn FROM OCEAN COBALT-RICH CRUST BY ACID LEACHING AND SOLVENT EXTRACTION

大洋富钴结壳是一种重要的深海金属矿 ,富含钴、镍、铜、锰等有价金属。该研究在常温常压条件下 ,利用二氧化硫或亚硫酸作还原活化剂和浸出剂 ,从大洋富钴结壳中快速浸出钴、镍、铜、锰等有价金属 ;浸出液氧化除铁 ,溶剂萃取分离钴、镍、铜 ,锰留在萃余液中 ;用碳酸铵沉淀回收锰 ,沉锰后液结晶析出硫酸铵。全流程金属回收率分别为 (% ) :Co 98 74、Ni 97 35、Cu 86 85、Mn 97 0 8,二氧化硫消耗 0

Ocean cobalt rich crust,one of the polymetallic mineral resources in deep sea,contains cobalt,nickel,copper and manganese Cobalt,nickel,copper and manganese in dilute sulfuric acid solution were quickly extracted by using sulfur dioxide(or sulfurous acid)as activator and reductant at ambient temperature and atmospheric pressure The iron in leach liquor was completely removed as iron hydroxide by oxidizing The extraction and separation of cobalt,nickel,copper from solutions was carried out by solvent extraction,leaving manganese in the raffinate Manganese was recovered by addition of ammonium carbonate In this process,a by product of(NH 4) 2SO 4 was obtained Metal recoveries are respectively:Co 98 74%,Ni 97 35%,Cu 86 85% and Mn 97 08% Activator consumption is 0 177t/(t·ore)